Your trainer: Bernie Zurella, a former World Kickboxing Association fighter and Army drill sergeant. He used that butt-kicking background to design these creative exercises for his wait-listed class Butt and Gutt (extra t because it's extra effective) at Gold's Gym in Long Branch, New Jersey. Now you get the exclusive.

You'll need: A stability ball. Dust 'er off!

Your plan: Combine these moves with this stability ball ab workout for one awesome workout three times a week. Or pick favorites (two or three, so you're constantly switching it up), and spend 5 minutes daily zeroing in on your trouble zones. Simple.

#sizematters Standard balls are 55, 65 and 75 centimeters. Sit on one. If your thighs are parallel to the floor, you've found your perfect fit.

Dimple Creator

Works: butt, outer thighs, obliques

Kneel and lean right hip against ball, right arm on top of it, left hand on hip, left leg out to side at hip level (as shown). Hold for 1 count, then touch left knee to ball. Extend leg back out for 1 rep. Do 12 reps; switch sides.

Tush Tightener

Works: butt, thighs, hamstrings

Stand in front of ball and rest right foot on top of it, right knee bent; raise arms overhead (as shown). Keeping left leg straight, bend at waist and reach toward left foot. Return to start for 1 rep. Do 12 reps; switch sides.

Kick-Ass Toner

Works: butt, abs, hamstrings

Stand facing ball with palms on top of it, arms extended, and raise right leg behind you (as shown). Draw right knee toward ball and hold for 1 count. Return to start for 1 rep. Do 12 reps; switch legs.